<?php

/**
 * Translating language with Google API
 * @author gabe@fijiwebdesign.com
 * @version $Id$
 * @license - Share-Alike 3.0 (http://creativecommons.org/licenses/by-sa/3.0/)
 * 
 * Google requires attribution for their Language API, please see: http://code.google.com/apis/ajaxlanguage/documentation/#Branding
 * 
 */
class Google_Translate_API {

        /**
         * Translate a piece of text with the Google Translate API
         * @return String
         * @param $text String
         * @param $from String[optional] Original language of $text. An empty String will let google decide the language of origin
         * @param $to String[optional] Language to translate $text to
         */
        function translate($text, $from = '', $to = 'en') {
                $url = 'http://ajax.googleapis.com/ajax/services/language/translate?v=1.0&q='.rawurlencode($text).'&langpair='.rawurlencode($from.'|'.$to);
                $response = file_get_contents(
                        $url,
                        null,
                        stream_context_create(
                                array(
                                        'http'=>array(
                                                'method'=>"GET",
                                                'header'=>"Referer: http://".$_SERVER['HTTP_HOST']."/\r\n"
                                        )
                                )
                        )
                );
                
		//echo "> $text $response <";
                
                if (preg_match("/{\"translatedText\":\"([^\"]+)\"/i", $response, $matches)) {
                        return self::_unescapeUTF8EscapeSeq($matches[1]);
                }
                return false;
        }
        
        /**
         * Convert UTF-8 Escape sequences in a string to UTF-8 Bytes. Old version.
         * @return UTF-8 String
         * @param $str String
         */
        function __unescapeUTF8EscapeSeq($str) {
                return preg_replace_callback("/\\\u([0-9a-f]{4})/i", create_function('$matches', 'return html_entity_decode(\'&#x\'.$matches[1].\';\', ENT_NOQUOTES, \'UTF-8\');'), $str);
        }
        
        /**
         * Convert UTF-8 Escape sequences in a string to UTF-8 Bytes
         * @return UTF-8 String
         * @param $str String
         */
        function _unescapeUTF8EscapeSeq($str) {
                return preg_replace_callback("/\\\u([0-9a-f]{4})/i", create_function('$matches', 'return Google_Translate_API::_bin2utf8(hexdec($matches[1]));'), $str);
        }
        
        /**
         * Convert binary character code to UTF-8 byte sequence
         * @return String
         * @param $bin Mixed Interger or Hex code of character
         */
        function _bin2utf8($bin) {
                if ($bin <= 0x7F) {
                        return chr($bin);
                } else if ($bin >= 0x80 && $bin <= 0x7FF) {
                        return pack("C*", 0xC0 | $bin >> 6, 0x80 | $bin & 0x3F);
                } else if ($bin >= 0x800 && $bin <= 0xFFF) {
                        return pack("C*", 0xE0 | $bin >> 11, 0x80 | $bin >> 6 & 0x3F, 0x80 | $bin & 0x3F);
                } else if ($bin >= 0x10000 && $bin <= 0x10FFFF) {
                        return pack("C*", 0xE0 | $bin >> 17, 0x80 | $bin >> 12 & 0x3F, 0x80 | $bin >> 6& 0x3F, 0x80 | $bin & 0x3F);
                }
        }
        
}


?>


